Hi, Welcome to HealthcareMagic Forum.
Yes they can go undetected at times, but not always as they are easily visible by Ultrasound scan.
It all depends upon the Quality of the USG Machine and the Expertise of the Radiologist.
Wish you Good Health.
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Can Ureteric Calculus Go Undetected On A USG ?
surely. Only about 70 % of ureteric stones are picked up by usg. The only 100 % test is CT scan